Frequencies for first 10,000 rows of prov2440 variable in pos2008 dataset :

       srv: |
  radiology |
(diagnostic |
          ) |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,655       86.55       86.55
          0 |         60        0.60       87.15
          1 |        908        9.08       96.23
          2 |        225        2.25       98.48
          3 |        152        1.52      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 17 May 2017